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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fa659037893b7d17ac44df3af055cb60c5c963276bba6e522bc9b2d14a6bab' 
  AND token = 'iZFw+LWY0xc6suhqjvgC7n7tLagvhca2Gw9hilE4kx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}